如何用Solidity操作Solidity结构？

Question

I'm writing a smart contract where I'm creating an object (struct) in one function, and then I want to alter the properties in a different function. One of the struct's properties is added in a mapping and that's how I track them, but even though I have created a function to get the properties of the struct from the mapping, I still cant quite figure out how to change them.

This is the struct

struct Component {

    uint compID;
    string compManufacturer;
    string compDetails;
    address owner;
    address[] pastOwners;
    bool transfer;
}

This is an example of a function where I try to change the values in the struct.

function transfer (address factory, uint id) public {

    address compad;
    address[] compowners;
    bool boolean;

    (,,, compad, compowners, boolean) = getComponent(id);

    require(component.transfer == true);

    component.owner = factory;
    pastOwners = pastOwners.push(factory);
}

The function getComponent returns everything that is in the struct and here I initialize some local variables to store the ones that I need. However, I'm not sure what I do afterwards works, because this way the local variables seem useless, and if I change the local variables the changes won't go through in the actual object. Please correct me if I'm wrong. Any help appreciated.

Answer 1

Assuming you have a mapping such as:

mapping(uint => Component) public components;

You can manipulate like this:

components[id].compDetails = "comp details";